A380629 Number of sensed regular combinatorial maps with n edges.
1, 2, 3, 9, 26, 135, 1124, 11225, 143600, 2156862, 36069006, 681844857, 14387370477, 327462904319, 8171705457024, 221137571070305, 6373582250114091, 197210862517274355, 6521583445100185049, 227168823675390365225, 8396976723995537706278, 327880018217851412105973
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..200
Programs
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PARI
a(n)={if(n==0, 1, sumdiv(2*n, d, T(d,2*n/d)))} \\ T(n,k) defined in A380622.
Formula
a(n) = Sum_{d|2*n} A380626(d,2*n/d) for n > 0.